scholarly journals Research on some influence factors in high temperature measurement of metal with thermal infrared imager

2011 ◽  
Vol 19 ◽  
pp. 207-213 ◽  
Author(s):  
QUAN Yanming ◽  
XU Hao ◽  
KE Zhiyong
Keyword(s):  
High Temperature ◽  
Temperature Measurement ◽  
Influence Factors ◽  
Thermal Infrared ◽  
Infrared Imager ◽  
High Temperature Measurement ◽  
Thermal Infrared Imager

Temperature Field Measurement of Turning Tool with Thermal Infrared Imager

2011 ◽  
Vol 305 ◽  
pp. 265-268
Author(s):  
Yan Ming Quan ◽  
Hao Xu ◽  
Zhi Yong Ke
Keyword(s):  
Temperature Field ◽  
High Temperature ◽  
Thermal Infrared ◽  
Rake Face ◽  
Surface Emissivity ◽  
Thermal Images ◽  
Infrared Imager ◽  
Measurement Results ◽  
Carbide Insert ◽  
Thermal Infrared Imager

The variety of surface emissivity of carbide insert P10 against temperature raise is calibrated with antitheses. The influence of high temperature object near the carbide insert and the open measurement environment of the thermal infrared imager on the calibrated values are investigated. Then the thermal images of turning tool’s rake face are continuously captured by an infrared imager in the designed turning experiment. In the analysis of thermal images, the influence of measurement environment is taken into consideration and varied emissivity values are used to analyze the temperature in different areas of the rake face. A series of measurement results of temperature field in the rake face are achieved and they are consistent with the conventional rules of turning researches.

The Development of Temperature Measurement System in Laser Molten Pool Based on Monochrome CCD with High Speed

2012 ◽  
Vol 566 ◽  
pp. 431-434
Author(s):  
Yun Xia Wu ◽  
Shi Hong Shi ◽  
Jia Li Yu ◽  
Ling Ling Yu ◽  
Jiong Jie Wu
Keyword(s):  
Temperature Measurement ◽  
Measurement System ◽  
Molten Pool ◽  
High Speed ◽  
Thermal Infrared ◽  
Present Condition ◽  
Infrared Thermometer ◽  
Infrared Imager ◽  
Temperature Measurement System ◽  
Thermal Infrared Imager

Due to the present condition of temperature examination in laser molten pool which is mainly limited to infrared thermometer and thermal infrared imager ,a temperature measurement system based on monochrome CCD with high speed is developed. By transforming gray value to temperature , grayscale images of molten pool will be changed into 2 dimension distribution with color, making examination more intuitive and comprehensive .

Study on characteristics of schottky temperature detector based on metal/n-ZnO/n-Si structures

2020 ◽  
Vol 12 ◽  
Author(s):  
Fang Wang ◽  
Jingkai Wei ◽  
Caixia Guo ◽  
Tao Ma ◽  
Linqing Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Measurement ◽  
Temperature Response ◽  
Large Temperature ◽  
Mems Devices ◽  
Temperature Range ◽  
Response Characteristics ◽  
High Temperature Measurement ◽  
Temperature Detector ◽  
Schottky Structure

Background: At present, the main problems of Micro-Electro-Mechanical Systems (MEMS) temperature detector focus on the narrow range of temperature detection, difficulty of the high temperature measurement. Besides, MEMS devices have different response characteristics for various surrounding temperature in the petrochemical and metallurgy application fields with high-temperature and harsh conditions. To evaluate the performance stability of the hightemperature MEMS devices, the real-time temperature measurement is necessary. Objective: A schottky temperature detector based on the metal/n-ZnO/n-Si structures is designed to measure high temperature (523~873K) for the high-temperature MEMS devices with large temperature range. Method: By using the finite element method (FEM), three different work function metals (Cu, Ni and Pt) contact with the n-ZnO are investigated to realize Schottky. At room temperature (298K) and high temperature (523~873K), the current densities with various bias voltages (J-V) are studied. Results: The simulation results show that the high temperature response power consumption of three schottky detectors of Cu, Ni and Pt decreases successively, which are 1.16 mW, 63.63 μW and 0.14 μW. The response temperature sensitivities of 6.35 μA/K, 0.78 μA/K, and 2.29 nA/K are achieved. Conclusion: The Cu/n-ZnO/n-Si schottky structure could be used as a high temperature detector (523~873K) for the hightemperature MEMS devices. It has a large temperature range (350K) and a high response sensitivity is 6.35 μA/K. Compared with traditional devices, the Cu/n-ZnO/n-Si Schottky structure based temperature detector has a low energy consumption of 1.16 mW, which has potential applications in the high-temperature measurement of the MEMS devices.

scholarly journals Geometric correction for thermographic images of asteroid 162173 Ryugu by TIR (thermal infrared imager) onboard Hayabusa2

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Takehiko Arai ◽  
Tatsuaki Okada ◽  
Satoshi Tanaka ◽  
Tetsuya Fukuhara ◽  
Hirohide Demura ◽  
...  
Keyword(s):  
Surface Roughness ◽  
High Surface ◽  
Thermal Inertia ◽  
Thermal Infrared ◽  
Shape Model ◽  
Infrared Imager ◽  
Least Squares Fit ◽  
Temperature Maps ◽  
Pixel Scale ◽  
Thermal Infrared Imager

AbstractThe thermal infrared imager (TIR) onboard the Hayabusa2 spacecraft performed thermographic observations of the asteroid 162173 Ryugu (1999 JU$$_3$$ 3 ) from June 2018 to November 2019. Our previous reports revealed that the surface of Ryugu was globally filled with porous materials and had high surface roughness. These results were derived from making the observed temperature maps of TIR using a projection method onto the shape model of Ryugu as geometric corrections. The pointing directions of TIR were calculated using an interpolation of data from the SPICE kernels (NASA/NAIF) during the periods when the optical navigation camera (ONC) and the light detection and ranging (LIDAR) observations were performed. However, the mapping accuracy of the observed TIR images was degraded when the ONC and LIDAR were not performed with TIR. Also, the orbital and attitudinal fluctuations of Hayabusa2 increased the error of the temperature maps. In this paper, to solve the temperature image mapping problems, we improved the correction method by fitting all of the observed TIR images with the surface coordinate addressed on the high-definition shape model of Ryugu (SFM 800k v20180804). This correction adjusted the pointing direction of TIR by rotating the TIR frame relative to the Hayabusa2 frame using a least squares fit. As a result, the temperature maps spatially spreading areas were converged within high-resolved $$0.5^\circ$$ 0 . 5 ∘ by $$0.5^\circ$$ 0 . 5 ∘ maps. The estimated thermal inertia, for instance, was approximately 300$$\sim$$ ∼ 350 Jm$$^{-2}$$ - 2 s$$^{-0.5}$$ - 0.5 K$$^{-1}$$ - 1 at the hot area of the Ejima Saxum. This estimation was succeeded in case that the surface topographic features were larger than the pixel scale of TIR. However, the thermal inertia estimation of smooth terrains, such as the Urashima crater, was difficult because of surface roughness effects, where roughness was probably much smaller than the pixel scale of TIR.

scholarly journals Miniaturized fiber taper reflective interferometer for high temperature measurement

2010 ◽  
Vol 18 (13) ◽  
pp. 14245 ◽  
Author(s):  
Jun-long Kou ◽  
Jing Feng ◽  
Liang Ye ◽  
Fei Xu ◽  
Yan-qing Lu
Keyword(s):  
High Temperature ◽  
Temperature Measurement ◽  
High Temperature Measurement ◽  
Fiber Taper
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